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79203b9869
Obtained from: KAME
191 lines
5.5 KiB
C
191 lines
5.5 KiB
C
/* $KAME: ah_aesxcbcmac.c,v 1.6 2003/07/22 02:30:54 itojun Exp $ */
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/*
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* Copyright (C) 1995, 1996, 1997, 1998 and 2003 WIDE Project.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/socket.h>
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#include <sys/queue.h>
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#include <sys/malloc.h>
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#include <sys/syslog.h>
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#include <sys/mbuf.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <netinet/in.h>
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#include <netinet6/ipsec.h>
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#include <netinet6/ah.h>
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#include <netinet6/ah_aesxcbcmac.h>
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#include <netkey/key.h>
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#include <crypto/rijndael/rijndael.h>
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#include <net/net_osdep.h>
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#define AES_BLOCKSIZE 16
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typedef struct {
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u_int8_t e[AES_BLOCKSIZE];
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u_int8_t buf[AES_BLOCKSIZE];
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size_t buflen;
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u_int32_t r_k1s[(RIJNDAEL_MAXNR+1)*4];
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u_int32_t r_k2s[(RIJNDAEL_MAXNR+1)*4];
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u_int32_t r_k3s[(RIJNDAEL_MAXNR+1)*4];
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int r_nr; /* key-length-dependent number of rounds */
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u_int8_t k2[AES_BLOCKSIZE];
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u_int8_t k3[AES_BLOCKSIZE];
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} aesxcbc_ctx;
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int
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ah_aes_xcbc_mac_init(state, sav)
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struct ah_algorithm_state *state;
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struct secasvar *sav;
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{
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u_int8_t k1seed[AES_BLOCKSIZE] = { 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1 };
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u_int8_t k2seed[AES_BLOCKSIZE] = { 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2 };
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u_int8_t k3seed[AES_BLOCKSIZE] = { 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3 };
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u_int32_t r_ks[(RIJNDAEL_MAXNR+1)*4];
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aesxcbc_ctx *ctx;
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if (!state)
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panic("ah_aes_xcbc_mac_init: what?");
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state->sav = sav;
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state->foo = (void *)malloc(sizeof(aesxcbc_ctx), M_TEMP, M_NOWAIT);
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if (!state->foo)
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return ENOBUFS;
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bzero(state->foo, sizeof(aesxcbc_ctx));
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ctx = (aesxcbc_ctx *)state->foo;
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if ((ctx->r_nr = rijndaelKeySetupEnc(r_ks,
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(char *)_KEYBUF(sav->key_auth), AES_BLOCKSIZE * 8)) == 0)
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return -1;
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if (rijndaelKeySetupEnc(ctx->r_k1s, k1seed, AES_BLOCKSIZE * 8) == 0)
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return -1;
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if (rijndaelKeySetupEnc(ctx->r_k2s, k2seed, AES_BLOCKSIZE * 8) == 0)
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return -1;
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if (rijndaelKeySetupEnc(ctx->r_k3s, k3seed, AES_BLOCKSIZE * 8) == 0)
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return -1;
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rijndaelEncrypt(r_ks, ctx->r_nr, k2seed, ctx->k2);
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rijndaelEncrypt(r_ks, ctx->r_nr, k3seed, ctx->k3);
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return 0;
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}
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void
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ah_aes_xcbc_mac_loop(state, addr, len)
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struct ah_algorithm_state *state;
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u_int8_t *addr;
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size_t len;
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{
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u_int8_t buf[AES_BLOCKSIZE];
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aesxcbc_ctx *ctx;
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u_int8_t *ep;
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int i;
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if (!state || !state->foo)
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panic("ah_aes_xcbc_mac_loop: what?");
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ctx = (aesxcbc_ctx *)state->foo;
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ep = addr + len;
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if (ctx->buflen == sizeof(ctx->buf)) {
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for (i = 0; i < sizeof(ctx->e); i++)
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ctx->buf[i] ^= ctx->e[i];
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rijndaelEncrypt(ctx->r_k1s, ctx->r_nr, ctx->buf, ctx->e);
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ctx->buflen = 0;
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}
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if (ctx->buflen + len < sizeof(ctx->buf)) {
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bcopy(addr, ctx->buf + ctx->buflen, len);
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ctx->buflen += len;
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return;
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}
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if (ctx->buflen && ctx->buflen + len > sizeof(ctx->buf)) {
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bcopy(addr, ctx->buf + ctx->buflen,
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sizeof(ctx->buf) - ctx->buflen);
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for (i = 0; i < sizeof(ctx->e); i++)
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ctx->buf[i] ^= ctx->e[i];
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rijndaelEncrypt(ctx->r_k1s, ctx->r_nr, ctx->buf, ctx->e);
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addr += sizeof(ctx->buf) - ctx->buflen;
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ctx->buflen = 0;
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}
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/* due to the special processing for M[n], "=" case is not included */
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while (addr + AES_BLOCKSIZE < ep) {
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bcopy(addr, buf, AES_BLOCKSIZE);
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for (i = 0; i < sizeof(buf); i++)
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buf[i] ^= ctx->e[i];
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rijndaelEncrypt(ctx->r_k1s, ctx->r_nr, buf, ctx->e);
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addr += AES_BLOCKSIZE;
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}
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if (addr < ep) {
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bcopy(addr, ctx->buf, ep - addr);
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ctx->buflen = ep - addr;
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}
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}
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void
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ah_aes_xcbc_mac_result(state, addr, l)
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struct ah_algorithm_state *state;
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u_int8_t *addr;
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size_t l;
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{
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u_char digest[AES_BLOCKSIZE];
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aesxcbc_ctx *ctx;
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int i;
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ctx = (aesxcbc_ctx *)state->foo;
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if (ctx->buflen == sizeof(ctx->buf)) {
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for (i = 0; i < sizeof(ctx->buf); i++) {
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ctx->buf[i] ^= ctx->e[i];
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ctx->buf[i] ^= ctx->k2[i];
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}
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rijndaelEncrypt(ctx->r_k1s, ctx->r_nr, ctx->buf, digest);
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} else {
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for (i = ctx->buflen; i < sizeof(ctx->buf); i++)
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ctx->buf[i] = (i == ctx->buflen) ? 0x80 : 0x00;
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for (i = 0; i < sizeof(ctx->buf); i++) {
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ctx->buf[i] ^= ctx->e[i];
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ctx->buf[i] ^= ctx->k3[i];
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}
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rijndaelEncrypt(ctx->r_k1s, ctx->r_nr, ctx->buf, digest);
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}
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bcopy(digest, addr, sizeof(digest) > l ? l : sizeof(digest));
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free(state->foo, M_TEMP);
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}
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